<template>
  <el-breadcrumb
      class="app-breadcrumb"
      separator-class="el-icon-arrow-right"
  >
    <transition-group name="breadcrumb">
      <el-breadcrumb-item
          v-for="(item, index) in breadcrumbs"
          :key="item.path"
      >
        <span
            v-if="item.redirect === 'noredirect' || index === breadcrumbs.length-1"
            class="no-redirect"
        >{{ generateTitle(item.meta.title) }}</span>
        <a v-else @click.prevent="handleLink(item)">
          {{ generateTitle(item.meta.title) }}
        </a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script setup lang="ts">
import {onBeforeMount, ref, watch} from 'vue'
import {useRoute, RouteLocationMatched} from 'vue-router'
import {compile} from 'path-to-regexp'
import router from '@/router'
import {generateTitle} from '@/utils/i18n'

const currentRoute = useRoute()
const pathCompile = (path: string) => {
  const {params} = currentRoute
  const toPath = compile(path)
  return toPath(params)
}

const breadcrumbs = ref([] as Array<RouteLocationMatched>)

function getBreadcrumb() {
  let matched = currentRoute.matched.filter((item) => item.meta && item.meta.title)
  const first = matched[0]
  if (!isDashboard(first)) {
    matched = [{path: '/dashboard', meta: {title: 'dashboard'}} as any].concat(matched)
  }
  breadcrumbs.value = matched.filter((item) => {
    return item.meta && item.meta.title && item.meta.breadcrumb !== false
  })
}

function isDashboard(route: RouteLocationMatched) {
  const name = route && route.name
  if (!name) {
    return false
  }
  return name.toString().trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
}

function handleLink(item: any) {
  const {redirect, path} = item
  if (redirect) {
    router.push(redirect).catch((err) => {
      console.warn(err)
    })
    return
  }
  router.push(pathCompile(path)).catch((err) => {
    console.warn(err)
  })
}

watch(() => currentRoute.path, (path) => {
  if (path.startsWith('/redirect/')) {
    return
  }
  getBreadcrumb()
})

onBeforeMount(() => {
  getBreadcrumb()
})

</script>

<style lang="scss" scoped>
.el-breadcrumb__inner,
.el-breadcrumb__inner a {
  font-weight: 400 !important;
}

.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>